columbus, ohio. slick also on i-40, from nashville, little rock. and on i-10, from houston to new orleans and san antonio. >> if you're flying today, you can expect airport delays in minneapolis, detroit, chicago, memphis, dallas and houston. the government has now put severe restrictions on prescribing the once popular diabetes drug avandia. europeans have gone one step further, pulling the drug off the market altogether. it's all because of avandia's link to heart attacks. here, now, is lisa stark. >> reporter: the battle against the diabetes drug, avandia, has been long and hard-fought. leading the charge, dr. steve nissen, a cardiologist at the cleveland clinic. >> people have been asking me, don't you feel vindicated? this is not personal vindication. it's about doing the right thing for patients. >> reporter: it was dr. nissen who first raised the alarm about avandia in 2007. he found it increased heart attack by 43%. the fda had approved the drug eight years earlier.